Check that the LL parameter is ON (LL=ON).
If you can't perform front panel communications even if LL=ON, check whether you can communicate using the back panel terminal.
If you can, it may be noise. Remove the communication lines.
Related Products & Solutions
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UT320 Digital Indicating Controller
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UT321 Digital Indicating Controller
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UT350 Digital Indicating Controller
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UT351 Digital Indicating Controller
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